Question

# Which of the following cases, a rigid body, necessarily has an angular acceleration.

A

Line of action of force is parallel to Axis of rotation

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B

Line of action of force is perpendicular to the axis of rotation

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C

Line of action of the force is perpendicular and skew to the Axis of rotation

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D

Line of action of the force intersects the axis of rotation

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Solution

## The correct option is C Line of action of the force is perpendicular and skew to the Axis of rotation For a body to have an angular acceleration there should be some net torque about any axis considered. Solution: If the force is perpendicular but its line of action intersects the Axis of rotation then it cannot produce any angular acceleration about the given and constrained "Axis of rotation”. i.e., |→T| = 0

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